一群动物在杰克家乡的海滩附近游泳。

A group of the animals were swimming close to the beach in Jake's hometown.

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有些动物学家试图完全研究透一种动物，有些试图研究一群动物，而有些试图研究新种类的动物是从哪里来的，还有一些对动物是如何患病的感兴趣。

Some try to learn everything about one animal and some learn about a group of animals, some try to understand where new kinds of animals come from and other zoologists are interested in how animals can get sick.

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门打开了，然后一群动物跳着就进来了。

The door opened and some animals hopped in.

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